I think, based on my SV roadcar and having swapped a fuel tank a while ago, the two items that you have linked too are interchangeable and you need a 'boot board' and a 'boot divider' in addition. IIRC you put the plywood/ally 'boot floor' in first and screw that to the small flat lip that sticks out from the turrets, then attach the 'divider', then attach the 'board' to the divider and the small lips that stickout from the chassis.